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Date: Sun, 9 Dec 2012 06:15:24 +0400
From: Solar Designer <>
Subject: Re: bitslice DES on GPU

On Sun, Dec 09, 2012 at 05:49:22AM +0400, Solar Designer wrote:
> Oh, there's also field code 255, which means "Literal constant", "32-bit
> constant from instruction stream".  Apparently, this is precisely the
> case when a GCN instruction is 64-bit rather than 32-bit.

No, it's not the only case when a GCN instruction is 64-bit.  There are
other cases as well - notably, there are LDS/GDS access instructions
that also perform computation, and these use 64-bit encoding too.


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